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The Arecibo Message was not broadcast with the aim that it would intercept with a notable astronomical object. Neither do we realistically expect that anyone will ever listen to the Voyager Golden Records. Such symbolic gestures are simply vectors for public relations and education. We send these "time capsules" into space because we can, as a showcase of ...


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The aperture of your 4.5" telescope is one thing, it's also important what focal length you have. Is it a f/5 or rather a f/8? The f/8 would be suitable for viewing the Moon, Jupiter, Saturn, maybe even Mars and Venus. You can also buy a good solar filter, attach it in the front of the optical tube assembly, and view the sun. But be careful with that, and ...


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The answer to your question is relatively straightforward: Not much. I'll delve into it in two parts: Star formation and the activity of the supermassive black hole at the center. Star Formation M87 is, according to Wikipedia, home to many Population II stars. They have little hydrogen and helium in them, and the clouds of gas and dust in the galaxy don't ...



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